Syringe.



A. BANDI/IAN.

SYRINGE.

APPLICATION FILED AUG.I8. 1911.

ALBERT BAND, 0F NEW YORK, N. Y.

SYRINGE.

Specification of Letters Patent.

Patented Feb. 11, 1919.

Application led August 18, 1917. 'Serial No. 186,857.

To all 'whom it may concern:

Be it known that I, ALBERT BANDMAN, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and'useful improvements in Syringes; and I dodeclare the following to be a full, clear, 'and exact description of theinvention, such as will enable others skilled in the art to whichitappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

My invention relates to syringes, particularly hypodermic syringes, andit hasl for its object to provide means for rendering practically fluidtight joints at the cap end and also at the needle end of the syringe.To that end the invention contemplates primarily a relatively soft orductile metal washer possessing the characteristics. of conformingclosely to the face formation of the compression member acting thereonwitho'ut spreading laterally to. an extent to seriously impair the closecontactunion between the face of the compression member and face of thewasher. Y

To the accomplishment of the foregoing and such other objects as mayhereinafter appear the invention consists in the features hereinafterparticularly described and then sought to be clearly defined by theclaiins, reference bein had to the accompanying drawing forming a parthereof and in which Figure 1 is a vertical section-through a syringeembodying the invention;

Fig. 2 is an end view of the compression ferrule. c

1n the drawing the numeral 1 designates the barrel of the syringe,2 theplunger, 3

` the end screw cap, 4 the needle point or cap,

the washer with which it will Contact isformed with an annular bead orridge 6' which will indent or embed in the face of y duly so that whencompression is applied the compression member or a part thereof willembed in the metallic washer anda fluid and air tight joint made betweenthe compression member and washer. The composition for the purposepreferably consists of bismuth, pure tin, and lead, in suitableproportions for the ends in view. Next to the barrel 1, and surroundingthe plunger rod 2, is a metallic washer 8, similar to washer 7, andbetween the two washers is a Washer 9 of leather or like material. Theend of the barrel next tothe washer 8 is preferably formed with a beadorridge 10 which will embed itself in the washer 9 when Lcompression isapplied to the several washers. rlhis compression is applied by screwingdown the end vcap 3 so as to press the ferrule against the washer 7 andthe washer 9 against the end of the barrel, thereby forming indentationsor depressions in the two metallic washers corresponding to the beads orridges on the ferrule and the end of the cap and also closely confiningthe leather washer between the two metallic washers. In the waymentioned al practically fluid and air t1ght joint is formed so thatthere can not be leakage of either liquid'or air at the end 0f thebarrel.

At the needle end of the barrel a' practically fluid tight joint isformed by providing a washer 11 of relatively soft or ductile metal likethe other washers mentioned which will surround the nipple 12 so that Iwhen the needle-point cap is screwed up on the nipple the edge of the cawhich will serve as a ferrule, will embe itself in the metal washerwhich will be pressed tightly against the leather washer 13 which fitsaround the nipple and bears against the end of the barrel. Y

By providing the ductile metallic washers at the needle end of thebarrel and at the hand end of the barrel 1 am enabled to form a syringe,hypodermic or otherwise, which is practically fluid tight at both ends.

The invention can be embodied in syringes of various types already onthe market, and

at a relatively small cost a most satisfactory lll@ syringe can beprovidedl which meets the conditions or requirements essential for themost efcient working of a syringe.

Having described my invention and set forth its merits, what I claim is:

1. In a syringe, the Combination with the barrel and plunger-rod, of aductile metallic washer and a non-metallic cushion ring both seatedabove the end of the barrel and encircling the plungerrod, a compressionmember positloned above the ductile metallic washer and formed with anannular bead or ridge in contact with the metallic washer, and means formoving the compression member to embed its bead into the body of themetallic washer.

2. In a syringe, the combination with the barrel and plunger-rod, of acap adjustably attached to one end of the barrel, a ductile metallicwasher andI a non-metallic cushion ring both encircling the plunger-rodand fitted within the cap to be seated above the end of the barrel, anda compression member within the cap and formed on its lower face with anannular bead o r ridge bearing against the metallic washer and adaptedto be embedded 'in the body of the washer on adjustment of the cap.

3. In a syringe, the combination with the barrel and plunger-rod, of acap adjustably attached to one end of the barrel, the end of the barrelbeing formed with an annular upwardly extending bead or ridge, acompresslon member within the cap and formed with an annular downwardlyextending bead or 35 ridge, ductile metallic washers encircling theplunger-rod, one resting on said upwardly extending bead or ridge andthe other bearing 'against said downwardly extending bead or ridge, anda non-n'letallic cushion ring 4( encircllng the plunger-rod, between`said ductile metallic rings, said metallic rings adapted to have saidbeads embedded therein on adjustment of the cap.

4. In a syringe, the combination with the 45 barrel and plunger-rod, ofa ductile metallic washer and a' non-metallic cushion ring bothenclrclmg an element of the syrin e, the barrel bemg formed with a seator the washer and ring, and a compression member 5( formed with anannular bead or ridge bearing against the face of the metalli washer andadapted to be embedded in said washer on application of pressure.

In testimony whereof I affix my signature 5F.

